A casualty is the damage, destruction, or loss of property resulting from an identifiable event that is sudden, unexpected, or unusual. 1  A sudden event is one that is swift, not gradual or progressive. 2  An unexpected event is one that is ordinarily unanticipated and unintended.
exists and is an alternate of . The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point onwards. The notation is shorter to write and makes it easier to identify elements.
The noble gases are helium, neon, argon, krypton, xenon, radon, and ununoctium. Noble Gas Properties. The noble gases are relatively nonreactive. This is because they have a complete valence shell. They have little tendency to gain or lose electrons.